Lubricating composition

Abstract

A lubricating oil composition having improved anti-oxidation properties comprising: a base oil comprising a Fischer-Tropsch derived base oil; and an organic dye compound.

I claim: 
     
         1 . A lubricating oil composition comprising:
 (a) a base oil comprising a Fischer-Tropsch derived base oil; and   (b) an organic dye compound.   
     
     
         2 . The lubricating oil composition according to  claim 1 , wherein the organic dye compound comprises an organic dye dissolved in a hydrocarbon solvent or petroleum distillate. 
     
     
         3 . The lubricating oil composition according to  claim 1 , wherein the the organic dye compound is present in an amount of between about 0.0001 and 0.001% by weight of the lubricant composition. 
     
     
         4 . The lubricating oil composition according to  claim 2 , wherein the organic dye is dissolved in kerosene. 
     
     
         5 . The lubricating oil composition according to  claim 2 , wherein the hydrocarbon solvent is selected from xylene, dimethylbenzene, and ethylbenzene. 
     
     
         6 . The lubricating oil composition according to  claim 1 , wherein the organic dye compound is a low flash dye. 
     
     
         7 . The lubricating oil composition according to  claim 1 , wherein the organic dye compound is a high flash dye. 
     
     
         8 . A lubricating oil composition according to any of  claims 1  to  8  wherein the Fischer-Tropsch derived base oil has a kinematic viscosity at 100° C. of from 1 mm 2 /s to 35 mm 2 /s. 
     
     
         9 . A lubricating oil composition according to any of  claims 1  to  8  wherein the base oil contains more than 50 wt. %, preferably more than 60 wt. %, more preferably more than 70 wt. %, even more preferably more than 80 wt. %, most preferably more than 90 wt. % Fischer-Tropsch derived base oil. 
     
     
         10 . Use of a lubricating oil composition according to any of  claims 1  to  8  for providing improved anti-oxidation properties, as determined by ASTM D6186-08. 
     
     
         11 . Use of a lubricating oil composition according to any of  claims 1  to  8  for providing improved deposit reduction properties, as determined according to ASTM D7097-09 or JPI-5S-55-99. 
     
     
         12 . Use of a lubricating oil composition according to any of  claims 1  to  8  for providing improved foaming performance. 
     
     
         13 . Use of a lubricating oil composition according to any of  claims 1  to  8  for providing improved air release. 
     
     
         14 . A method for lubricating a, the method comprising the step of lubricating said engine with the oil composition of any of  claims 1 - 8 , wherein the step of lubricating the engine results in a reduction of the amount of oxidation products that are formed. 
     
     
         15 . A method for lubricating an engine, the method comprising the step of lubricating said engine with the oil composition of any of  claims 1 - 8 , wherein the step of lubricating the engine results in a reduction in the amount of deposits that are formed. 
     
     
         16 . A method for lubricating an engine, the method comprising the step of lubricating said engine with the oil composition of any of  claims 1 - 8 , wherein the step of lubricating the engine results in improved foaming performance. 
     
     
         17 . A method for lubricating an engine, the method comprising the step of lubricating said engine with the oil composition of any of  claims 1 - 8 , wherein the step of lubricating the engine results in improved air release.